Abstract: A printing-plate mounting-position instruction system instructs a worker where to mount a plurality of printing plates in a rotary printing press. The system includes a controller, a reader, a judging device, and a display device. The controller creates assignment information for assigning printing plates to mounting positions on each of plate cylinders used in each of printing units on the basis of production instruction information. The reader reads a mark on a printing plate for printing-surface information. The judging device is connected to the controller and the reader and collates the assignment information received from the controller and the printing-surface information received from the reader, thereby judging the location where the printing plate is to be mounted. The display device displays the result of the judgment.

Abstract: A method of printing using a press having first and second printing units and responsive to electronic data includes the steps of running the press to cause first and second printing units to produce first and second printed components, respectively, on a substrate, stopping the press and inspecting the first and second printed components to determine a degree of misregistration of the first printed component relative to the second printed component caused by substrate growth. Original electronic data representing an image to be printed by the press are modified in dependence upon the degree of misregistration. The press is subsequently operated in accordance with the modified electronic data to print the image with a reduced degree of misregistration.

Abstract: A method of making printing plates for color newspaper printing almost free from causing color dislocation. The present invention includes an exposure step 12 of directly drawing a desired image on a plate material E from a plate feeding step 11 by laser beam according to image drawing signals from a computer, a development and fixing step 13 of treating the exposed surface to produce a printing plate 5 with the desired image, and a bending and boring step 14 of forming bent edge stoppers 5a, 5b at the two edges of the printing plate 5 for mounting the plate 5 on the plate cylinder 4 and at least one positioning hole 5c for positioning the plate 5 on the plate cylinder 4. In the exposure step 12, pilot marks P in a desired shape are drawn near the two edges of the plate material E at the same time that a desired image T is drawn on the image drawing area Q of the plate material E according to image drawing signals from the computer.

Abstract: A device is described for the state display for a printing machine, more specifically a sheet offset printing machine. The printing machine has a control, which is usually a computer, that communicates with several sensors and with a display device/computer. These sensors are located throughout the printing machine and can detect the position of certain elements of the machine. The invention extends the traditional printing machine state display so that it not only displays the simple state of the machine but also monitors previous states and can accomplish complex analysis of machine malfunctions. To accomplish this, the invention uses a storage device, which contains data on the representation and configuration of the machine and the sensors located in the printing machine. The control receives the data from the sensors and the storage device and sends graphical data to another computer that may process the information and present it to a display device.

Abstract: A printing plate for an offset printing machine which comprises an electrically non-conductive material adapted for mounting on a plate cylinder of the printing machine and which has cuts in at least one area thereof adapted to cooperate with register pins arranged on the plate cylinder. An electrically conductive layer is arranged on the printing plate in the area of the cuts for making electrical contact with the register pins to facilitate proper mounting of the plate on the cylinder.

Abstract: A conveying unit is disposed so as to be swingable above a recording drum. The conveying unit has a first plate carry-in conveying path and a second plate carry-out conveying path. A punching device is disposed in the plate on the side of a front end of the conveying unit. The plate is conveyed to the punching device through the first conveying path in the conveying unit before being conveyed onto the recording drum. Recording drum positioning holes and printing machine positioning holes are formed at a front end of the plate. The recording drum positioning holes of the plate are respectively fitted on positioning pins provided on an outer peripheral surface of the recording drum.

Abstract: Methods and apparatus for adjusting the position of a printing screen having a center of rotation mounted on a screen frame for use in screen printing processes are disclosed. The apparatus includes a screen frame with a printing screen mounted thereon, a screen frame holder, a plurality of first arcuate guides mounted on the screen frame defining an arc with a predetermined circumference defined by a predetermined radius, a plurality of guide rollers mounted on the screen frame holder and corresponding to the plurality of first arcuate guides whereby the plurality of guide rollers movably supports the plurality of first arcuate guides and an adjustment mechanism adapted to urge the screen frame around the center of rotation of the printing screen.

Abstract: A head for a printer and an image processing system is provided in which light emitted from light emitting elements formed on a substrate of the head does not leak from pinholes of a non-corresponding light emitting elements and does not interfere with light emitted by other light emitting elements, so that satisfactory printing can be carried out. An aperture has on opposite ends sandwiching portions and covers a substrate to sandwich a carriage. Concave portions are formed correspondence with light emitting elements. Pinholes are provided in a front wall and an insulating black coat is formed on the surfaces of the concave portions to prevent a short circuit. Light from the light emitting elements which does not pass through the pinholes is absorbed by the surfaces of the concave portions.

Abstract: Flexible plates are placed on a plate cylinder by inserting leading and trailing plate suspension legs into cooperating slits. Each of the plate suspension legs is pushed into the receiving slit by an insertion device that uses plate front and rear insertion sliders. These two insertion sliders each act as a guide for the adjacent slider.

Abstract: A method for imaging seamless printing sleeves of varying length and diameter includes providing a retractable support for the end of a mandrel holding the sleeve and a tilting mechanism to title the mandrel upwards, allowing sleeve replacement. Since different length sleeves can be used on a fixed length mandrel, a fixed size frame can be used for different sleeve lengths. Tilting of the mandrel allows the use of a rigid frame, eliminating the need for a removable end block.

Abstract: A printing method for performing a lithographic printing in multiple colors by use of a flexible plate material. In particular, a series of engaging holes, while being aligned in the transporting direction of the plate material, are formed for every color in the plate material, and a series of protruded pieces to be inserted into the engaging holes of the plate material, while being aligned in the circumferential direction of each plate cylinder, are formed on the outer peripheral surface of each of the plate cylinders provided for the respective colors, so as to satisfy the following relation: 2D≦P≦4.06×103×D/W where Pmm: pitch of the series of engaging holes (protruded pieces) Dmm: diameter of each protruded piece Wmm: width of the printing plate. The plate material is attached to the plate cylinder by applying the engaging holes of the plate material to the protruded pieces of each plate cylinder, and printing is carried out.

Abstract: A method for compensating for image distortion imparted on a flexographic printing plate is disclosed. The compensation scheme reduces the distortion effect caused by stretching of the image when the printing plate is wrapped around the cylindrical drum of a printing press. The compensation scheme predicts the localized distortion on different parts of the image caused by variations in the undercut depth and density of the image features on the plate. By so doing, the scaling factor is varied in accordance with the predicted localized distortion in the different parts of the image, so as to minimize the distortion effect over the entire printing plate.

Abstract: A printing master 12 is described which includes a printing element and a base 33, characterized in that base 33 is provided with one or more strain gauges 31 and electric connections for measuring electric resistance. In a preferred embodiment, the printing element is a plate having a printing surface 35, of which the back side 37 is laminated to base 33. The printing master 12 may have an optional adhesive layer 36 and/or protective layer 32. The registration of the printing master can be adjusted conveniently and accurately by measuring the resistance of the strain gauges.

Abstract: The present invention is directed to a web fed rotary printing press which can perform a printing plate change on the fly, while preventing the printing plate from touching an associated moving blanket cylinder. In accordance with exemplary embodiments, a nip roller is used to securely press the printing plate toward the plate cylinder during printing plate replacement, such that only a small gap exists between the stopped plate cylinder and the moving blanket cylinder. As such, the entire printing unit need not be modified to account for ink train cylinder movement.

Abstract: A method provides for mounting at least one photosensitive printing element onto a cylindrical element containing a previously mounted first photosensitive printing element without contacting an outermost surface of the first photosensitive printing element.

Abstract: The invention relates to a method for monitoring the quality of a moving web of multicolor print during a printing process, including monitoring the mutual location of the various colors on the basis of marks arranged on the web of print and further monitoring the location in longitudinal direction and transversal direction of the web of print in relation to at least one printing press.

Abstract: There is disclosed an apparatus for identifying a page of printing plate or printed product. The apparatus comprises reading head means for reading out at least one of items in a local descriptive portion of the page of printing plate or printed product. The apparatus further comprises identifying means for identifying the page of printing plate or printed product in accordance with the read out data transmitted from the reading head means.

Abstract: A system and method for controlling registration between different printing plates or printing cylinders in a printing press which includes a camera with a lens having at least two zoom settings and a control unit for changing the zoom setting of the camera in accordance with a distance between registration marks printed on a printed substrate found in at least one image acquired by the camera.

Abstract: The invention relates to a method and device for positioning a flexible printing plate in a desired position on a flexible carrier arranged on a table, the method comprising the steps of placing the printing plate at a first easily accessible position on the table and subsequently moving the printing plate from the first position to the desired position on the flexible carrier in accordance with a predetermined direction and distance; and wherein the device comprises a flat table, means for positioning the flexible carrier, means for determining the location of the carrier in a first easily accessible position, and transporting means for transferring the printing plate from the first position to the predetermined position on the flexible carrier.

Abstract: In a stencil printer, a printing drum is provided with a clamp plate for clamping an end portion of a stencil master, thereby holding the stencil master on the printing drum. A paper supply mechanism supplies printing sheets to the printing drum in synchronization with rotation of the printing drum. A first motor drives the paper supply mechanism by way of a first transmission mechanism, and a second transmission mechanism is operatively connected to the first transmission mechanism to be driven by the first motor by way of the first transmission mechanism, thereby rotating the printing drum. A phase adjustment mechanism driven by a second motor drives the second transmission mechanism with the first transmission mechanism held stopped, thereby changing the relative phases of rotation of the printing drum and sheet supply operation of the paper supply means. A drum position sensor generates a detecting signal upon detection that the printing drum comes to a reference position.

Abstract: The present invention generally describes register control equipment for the cylinder of a printing machine. It specifically pertains to the printing plate of sheet-fed offset printing machine that has fitted register pins. The register pins are electrically insulated with respect to the cylinder and emit a signal when a printing plate is resting in register on one or more of the pins. The signal is communicated to a stationary evaluation unit by an electrical contact adapted to contact the printing plate. The evaluation unit uses the communicated signal to determine whether or not insertion was properly performed.

Abstract: A method for recording a rectangular image along helical tracks on a plate, while the plate is mounted on a cylindrical surface in an imagesetter, so that an edge of the image, corresponding to a reference edge of the plate, essentially parallels the reference edge. The method includes punching one or more notches across the reference edge of the plate, providing two stop pins, fixedly attached to the cylindrical surface, and positioning the plate on the cylindrical surface so that one of the stop pins engages one of the notches.

Abstract: A registration system (10) maintains registration of colors printed on a lenticular material (M) by a printing press (P) to form an image (I). A predetermined pattern (12) is printed on the material together with the image. A camera (36) obtains an image of each printed pattern as the lenticular material moves from one end of the press to the other, a strobe (40) and an image magnifier (34) also being used for this purpose. A monitor (32) displays the image for an observer to determine if the printed colors are properly registering with each other. A controller (46) for adjusting the position of print rollers (R) is operable by the observer to adjust the rollers, as necessary, for an observed printed color determined to be not properly registering with the other printed colors to be brought into registry therewith. A baseline pattern (14) is printed as are bars (28) for each printed color.

Abstract: A method of printing multi-color images on pressure sensitive labels carried on a web uses a disk shaped mark for each color which is printed to form the image. The disks (spots) are printed on the image, or elsewhere on the top layer of the web, with one disk being printed on top of the other, so that the marks coincide in size, shape and position. If a color is misregistered, it appears as a crescent which extends beyond the multi-colored disk. Such misregistration may be immediately viewed on a video magnifier, using at least 400.times. magnification, and the misregistration corrected.

Abstract: The present invention relates to a mechanism for and method of applying labels, printing images, or scanning a feature on the surface of a substrate. The mechanism (1) comprises a read/write/apply means (4) for reading, writing or applying the information, carried and located relative to a predetermined position by a robotically actuated device. The device comprises a mounting member (5), a support member (6) relatively movable with respect to the mounting member (5) and carrying the said means (4), and at least three pairs of extendable arms (7,8,9) extending between and pivotally mounted on the members (5,6). The arrangement is such that one arm in each of said pairs of arms (7,8,9) cooperates with an arm from another pair of arms. Extension and/or retraction of the arms (7,8,9) causes movement and/or rotation of the support member (6) relative to the mounting member (5), whereby the said means (4) may be located relative to the predetermined position.

Abstract: A CD printer for printing labels on compact discs print information on a CD centered on a print program center. A support for the CD is movable in one axis. The printer moves on a perpendicular axis. The axis forms a plane parallel to the plane of the disc. The CD may be centered selective to the printer program by printing on the disc a first series of lines that are radially spaced and extend from the CD center along both of the axes, and then rotating the CD 180.degree. and printing a second set of lines which are radially spaced along each of the axes but are spaced a radial distance less than the lines printed in the first printing. A vernier is established and where the lines align, the amount of offset from a centered position is indicated. Offset can be corrected by moving the tray and print head on its mounting in the respective directions to a new zero position indicated by the vernier display.

Abstract: In a process and a device for adapting the position of printing plates (4) to the deformation (fan-out) of the paper web (2) to be printed through damp, ink absorption and mechanical stress on passing between several successive pairs of printing rolls (1) and also for adaptation to deformations possibly occuring in the fixing device of a printing roll (1) and resultant changes in the position of a printing plate (4), the printing plate (4) and/or the mount holding it in the stamping or bending machine (5) is moved or shifted laterally, in the circumferential direction and/or angularly by the amount required for said printing plate (4) on the printing roll (1) owing to said deformation of the paper web (2) to be printed, in order to obtain a print corresponding with a preceding printing roll (1), as considered in the direction of feed of the paper web, despite the paper deformation that has meanwhile occured. Thereafter the deformations, i.e.

Abstract: A high speed screen printing machine (20) is provided for accurately imprinting images on segments (205) bearing indicia (206) of a transparent web (34, 36). The machine (20) includes a vacuum platen (24) which is transversely adjustable to accommodate webs of differing widths, a camera assembly (28) beneath the platen (24) and indicia (206), and an X, Y, .theta. adjustable frame (30) supporting an upper screen frame support assembly (32) adapted to hold a printing screen (208) provided with reference indicia (212). When a segment (205) is initially positioned and held by platen (24), the camera assembly (28) is used to generate a combined image of the indicia (206) through the segment (205) and the screen reference indicia (212); a microprocessor controller uses this data, together with positional information establishing the location of the screen frame support assembly (32), and activates the three-motor adjustment frame (30) for simultaneous X, Y and .theta.

Abstract: A process and device for synchronizing a cylinder of a printing press, which is pivoted up to its countercylinder, and to a shaft encoder suitable for carrying out this process.

Abstract: A substrate bears holographic imagery, selected portions of which are covered by non-holographic imagery printed in predetermined geometric registry with the holographic images. Multiple replicas of this interactive graphic work are mass-produced by embossing an array of the holographic imagery into a substrate in roll form, together with eyemarks located periodically along the roll. Using these eyemarks, the roll is optically sheeted and the non-holographic imagery then printed on the holographic substrate.

Abstract: An apparatus and method for mounting a plurality of plates onto a carrier sheet includes a table mounted on a stationary base, each plate having a first and a second registration mark thereon. A first camera assembly is moveably attached to a support adjacent the table and is connected to a first video monitor for viewing the first registration marks. A second video camera is moveably attached to the support adjacent the table and is connected to a second video monitor for viewing the second registration marks. Linear actuators are connected to the first and the second camera assemblies and to the table for independently moving each camera assembly relative to the table. A motion controller is connected to the linear actuators for sending moving signals thereto, and generates at least two moving signals corresponding to the two registration marks for each plate.

Abstract: A detachably mounted pallet tool is utilized on the arms of a carousel printing machine and work support pallets thereon to provide a more efficient and rapid registration with stationary screen frames associated with the machine, without removal of work support pallets from the arms. A bracket on an arm and cooperating fitting on the pallet tool provide for quick, detachable mounting and removal of the pallet tool.

Abstract: A digital printing machine including an endless conveyer belt having an elongated section whereon substrates to be printed are successively transported through the printing machine in a transport direction includes at least one printing unit having a cylinder arranged opposite the elongated section of the conveyer belt and the substrates conveyed thereon, respectively, the cylinder having an axis extending transversely to the transport direction and being rotatable in synchronism with the transporting movement of the conveyer belt, so as to transfer printing ink to the substrates in accordance with a distribution corresponding with a desired printing image, the cylinder being disposed so that an angle defined between the cylinder axis and the transport direction has a value differing from 90.degree..

Abstract: Removable print roll sleeves are changed on a printing press without removal of a respective print roll from the press frame by securing the position of the print roll on the drive side axle bearing while the outboard axle bearing for the roll is removed. A bracket on a support tree has a motorized strut which bears upon an extension of the print roll axle shaft from the drive side axle bearing. This support tree may be rotated 90.degree. about a vertical axis when not in use for minimum interruption and storage. On the outboard side of the print cylinder, the axle shaft bearing is mounted on a bearing carriage for disengagement from the axle shaft journal and withdrawn by a lead screw at a 45.degree. angle along a slide plate.

Abstract: The several screen frames of a multistation screen printing machine, such as a carousel screen printer, having multiple work supports movable to the printer stations in succession to effect successive printing of screen images on work pieces fixed to the supports are precisely registered with the work supports by providing each frame with registration means precisely located relative to the screen image on the frame, providing a selected work support with registration means precisely located relative to the printing position of a work piece on the selected support, effecting movement of the selected work support to the print stations in succession, adjusting the corresponding screen frame to directly align its registration means with the registration means on the selected work support, and securing the frame in fixed position.

Abstract: In a printing machine with a rotary drum (1) for franking envelopes (4), each print operation is performed at a constant rotational speed in a given direction, whereafter the direction of rotation of the drum (1) is reversed so that for the next print operation, the rotational speed of the drum (1) may be increased in said direction over a greater angle to achieve said constant speed.

Abstract: An automatic register control system for multi-color rotary presses having adjusting means for adjusting the phase on a plate cylinder of each printing section, comprising a registering error detecting device that reads register marks each printed on a traveling paper web by each printing section with a CCD camera as image data, corrects the image data using inherent correcting means, and detects the characteristic points of the register marks as their coordinates to detect a deviation between the actual coordinates of the detected characteristic points and the desired coordinates thereof, and adjusting signal output means for outputting an adjusting signal to the adjusting means to adjust the phase of the plate cylinder in each printing section on the basis of the deviation detected by the registering error detecting device, thereby automatically adjusting registering errors in the multi-color rotary press.

Abstract: A system and method for controlling registration between different printing plates or printing cylinders in a printing press which includes a camera with a lens having at least two zoom settings and a control unit for changing the zoom setting of the camera in accordance with a distance between registration marks printed on a printed substrate found in at least one image acquired by the camera.

Abstract: A method and an apparatus for axially positioning a flexible plate on a surface of a cylinder, that is divided into several axially spaced segments, utilizes a plate transport arrangement to transfer plates from a plate preparation device to the plate cylinder. The plate is axially shiftable during transport and arrives at the plate cylinder in proper axial position.

Abstract: This invention discloses an universal chuck for holding plates, including a base having a longitudinal axis and a transverse axis, a lower carriage movable on the base along said longitudinal axis, an upper carriage movable on the lower carriage along the longitudinal axis, a plate mounting carried by the lower carriage at one side thereof for mounting one edge of a plate to be held by the universal chuck, and a plate mounting carried by the upper carriage at the side thereof opposite to the one side of the lower carriage, for mounting the opposite edge of the plate to be held by the universal chuck, such that moving the lower carriage and the upper carriage with respect to each other and with respect to the base along said longitudinal axis, changes the distance between the lower carriage and upper carriage plate mountings to thereby enable the chuck to hold plates of different longitudinal dimensions.

Abstract: Printer heads are precision mounted relative to a plate on a printer carriage by assembling a plurality of identical printer head assemblies, each of the printer head assemblies including a printer head precision mounted to a printer head carrier, each of the printer head carriers having at least three alignment points. Openings are provided in a plate in precise locations corresponding to desired locations and orientations of the printer head assemblies on the plate. The openings each have at least three alignment points corresponding to the three alignment points on each of the printer head carriers. The printer head assemblies are positioned in corresponding ones of the openings and a force is applied against the printer head assemblies, such as by springs mounted on the plate, to cause the at least three alignment points on the printer head carriers to contact respective ones of the at least three alignment points in the corresponding ones of the openings.

Abstract: A printing unit for a web fed rotary printing press for printing newspapers is provided in which the central impression cylinder (2) is commonly rotatably mounted in the two side walls (14a, 14b) of the housing (14) of the printing press and the blanket cylinder (4) and/or print cylinder (6) are rotatably cantilevered on one end in the first side wall (14a) during the make ready operation of the printing press, allowing a quick and easy changing of the cylinders (4, 6) via an opening (30) formed in the second side wall (14b). When the printing press is in operation the blanket and print cylinders (4, 6) may be additionally rotatably supported in a side plate (32) fitted to the opening (30), or may remain unsupported on their other ends.

Abstract: A pre-registration system for a printing press may be provided with a first detector for detecting an angular position of a first rotatable printing cylinder by sensing when a reference mark disposed on the first printing cylinder is in a predetermined angular position, a second detector for detecting an angular position of a second printing cylinder by sensing when a reference mark of the second printing cylinder is in a predetermined angular position, and an adjustment mechanism for automatically adjusting the angular position of one of the printing cylinders based on the circumference, a web distance, and the angular position of one of the printing cylinders. The adjustment mechanism may adjust the angular position based upon a stored phase data relating to the web distance and the circumference.

Abstract: An electronic image processing apparatus including a controller and a plurality of modules having an arbitrary configuration and being interconnected by input and output ports. The interconnection or port pairings of the modules is determined by the controller by defining ports into input and output sets and defining a given set by logic signals. The logic signals are set to the same level and a logic level change in the logic signals is systematically prompted. The responses from associated ports are identified to map all input and output ports for the image processing apparatus.

Abstract: The present invention relates to a device for replacing printing plates in rotary printing presses, particularly in web-fed rotary printing presses for printing both sides of a material web. The printing presses have at least one printing unit which has a cylinder having a clamping device within a cylinder gap for clamping the ends of a printing plate wound around the surface of the cylinder. The plate cylinder has a removal device for removing the printing plates released by the plate cylinder, as well as an infeed device for new printing plates to be fastened on the plate cylinder. The invention includes a plate cylinder of a lower printing unit with associated pivotable plates to be fed, as well as pivotable holding devices for the printing plates to be removed from the plate cylinder. The feed and the holding devices support the printing plates in a hanging position.

Abstract: A printing machine includes a plurality of printing rolls for custom printing multi-coloured indicia or designs on corrugated cardboard boxes. Each roll prints with ink of a different colour to the others. The design is prepared on a computer using graphics design tools and separated into components of a specific colour each. The designs are distorted asymmetrically no compensate for curvature error and each component is printed on a separate sheet of polyester or other transparent, dimensionally stable material. In one preferred embodiment, outline indicia of each element in a design component is printed on the sheet. In another embodiment, to save time, coordinate marks and identification indicia are printed on the sheet. Dies corresponding to each element are manufactured separately. A printing mantle is assembled for each roll by affixing the dies in positions determined by the printed indicia.

Abstract: Apparatus is provided for aligning two objects (1,2), such as a board and screen in a screen printer, each having at least one reference mark (6a,7a) on a surface thereof, whereby alignment of the objects is indicated by alignment of corresponding reference marks on the surfaces of the objects. The apparatus comprises support means for supporting the objects in use with the said surfaces facing one another, and imaging means (20), mounted for movement between the said surfaces in use, for acquiring, on a single imaging surface thereof, simultaneous images of respective areas of the surfaces of the objects, which areas contain corresponding reference marks. The apparatus includes control means (4,8) for determining the locations of the reference marks in the images and determining therefrom the extent of misalignment of the objects, and means (3), responsive to the control means, for adjusting the relative positions of the objects to bring the objects into alignment.

Abstract: An offset printing method is suitable for high-precision printing. Errors caused by the relative movement between a blanket cylinder 4 and a form plate 10 and the rotation of the blanket cylinder 4 on its axis which are produced in a step of transferring an ink image to the blanket cylinder 4 from the form plate 10, are reproduced in the relative movement between the blanket cylinder 4 and a surface to be printed on 11 and the rotation of the blanket cylinder 4 on its axis in a step for printing the ink image on the surface to be printed on 11 from the blanket cylinder 4. The dimensional errors produced in the ink image transferred to the surface 12 of the blanket cylinder 14 of the offset printing methods are cancelled when transferring the ink image from the surface of the blanket cylinder 4 to the surface to be printed on.

Abstract: A printing method and apparatus for printing different indicia, such as account numbers, on selected documents without changing plates or stopping the press during a press run. Different indicia are provided at two or more lines on a printing plate, each line being separated from an adjacent line on the plate by a predetermined distance relative to movement of the plate in a press. The plate transfers images to a blanket having a region that does not contact the plate and thus receives no image of the plate area that registers with the noncontacting region of the blanket. The plate and blanket initially are aligned so that the noncontacting region registers with one set of indicia on the plate, so that the blanket receives a partial inked image lacking that indicia. That partial inked image is transferred to sheets passing through the press.

Abstract: A mechanism for securely clamping a .[.priming.]. .Iadd.printing .Iaddend.plate (6) to a form cylinder (1), in which a cylinder groove (2) formed in the form cylinder (1) has rotatably mounted therein a clamping spindle (7), which has a gripper edge (10) which clamps a V-shaped chamfer (11) of the leading flange (5) of the .[.priming.]. .Iadd.printing .Iaddend.plate (6). The trailing flange (9) of the .[.priming.]. .Iadd.printing .Iaddend.plate (6) is grasped and clamped in a positive-locking manner by leaf springs (8) mounted to the clamping spindle (7) which are hook-shaped.